Blackboard attachment



(o Model.)

J. W. HUNGAD.

BLAGKBOARD ATTACHMENT. 1\o./L166,606 Y Patented Jan. 5, 1892.

UNITED STATES PATENT OFFICE.

J OIIN IV. HUNGAD, OF ROCHESTER, NEXV YORK.

BLACKBOARD ATTACH MENT.

SPECIFICATION forming part of Letters Patent No. 466,606, datedJanuary 5, 1892. Application nea March s, 1891. serai No. 383,647. (No model.)

To @ZZ whom it may concern:

Be it known that I, JOHN WV. HUNGAD, of Rochester, in the county of Monroe and State of N ewYork, have invented a certain new and useful Improvement in Blackboard Attachments; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to'the drawings accompanying this specification.

This invention relates to devices attached to the bottom of blackboards for the purpose of cleaning the erasers and holding the crayons; and it consists in the combination of a set of parallel strained wires on which the eraser can be cleaned, and a carrier provided with tubular bearings which embrace all the wires, said carrier serving the double purpose of holding the crayons, being movable from end to end of the wires, and of cleaning the Wires ot' challcdilst, all as hereinafter described.

In the drawings, Figure 1 is aperspective view of the lower portion of a blackboard with my improvement attached. Fig. 2 is a cross-section of the board and a plan view of the attachment. Fig. 3 is an enlarged crosssection. Fig. t is an elevation showing the straining device for the wires.

A indicates an ordinary blackboard, provided at its bottom with a ledge B for catching the chalk-dust. C is the rack erected on this ledge. It consists of three parallel wires a a a, attached to bearings b b b, screwed fast to the ledge, the wires resting some little distance above the ledge to allow the chalk-dust to fall through. The wires are connected to the end bearings by screw-bolts c c, by which means the wires can be drawn taut. In crosssection the wires are located in concave form, so as to hold the erase-rs more effectively when placed thereon.

D is the carrier which runs on the wires. It consists ot' an exterior open frame d, provided with small tubular bearings g g g, which slide on the wires, and an interior open-topped box or receptacle f, which holds the crayons.

This box is removable, so that it can be cleaned of dust at any time.

The parallel Wires above described serve as a surface on which to scrape and clean erasers,

the chalk-dust falling through to the ledge 5o` below. The spaces between the wires, being` unimpeded, allow free passage ofthe dust, and are more eitective than the wire screen or network heretofore used. At the Sametime these wires furnish a track for the passage of the carrier from end to end ot' the blackboard, or over a given section. of its length if the blackboard is very long.

The carrier serves not only as a holder of the crayons to enable them to be moved from one end to the other to be within easy reach of the user, but it also serves as a cleaner' of the wires, the tubes g g g being of such length as to cover considerable s pace of the wires. The wires are thus kept clean by the constant motion of the carrier in being slid from one end to the other, and it prevents the soiling of clothing, which occurs where fine dust gathers thereon. The three wires form a broad surface on which erasers can be readily cleaned.

Having described my invention, I do not claim a wire net at the bottom of the blackboard.

W'hat I claim as new, and desire to secure by Letters Patent, is-

l. In a blackboard, the combination of the parallel Wires a ct a, forming a cleaning-surface and a track, and the carrier D, provided with tubular bearings g g g, running thereon, forming a crayon-holder and wire-cleaner, as herein shown and described.

2. In a blackboard, the combination of three parallel wires a a a, the bearings b b, to which they are attached, the screw-bolts c c for straining the wires, the carrier-frame CZ, provided with the tubular bearings gg g, running on the wires, and the removable box f, resting in the frame, as shown and described, and for the purpose specified.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

JOHN 7. IIUNGAD.

Vitnesses:

R. F. OseooD, WM. J. McPHERsoN. 

